Answer: c
Explanation: The formula for gauge length (Lo) is Lo= 5.65* root over of Area of cross section. We know that under root 4 is 2, therefore 5.65*2 is equal to 11.3 m.

4. Which of the following does not affect the value of ultimate tensile strength?
a) Quality of surface finish
b) Speed of testing
c) Dimensional accuracy of the specimen
d) Length of the specimenView Answer

Answer: d
Explanation: The length of the specimen does not affect the value of ultimate tensile strength. While the quality of surface finish, speed of testing, dimensional accuracy of the specimen affect the value of ultimate tensile strength.

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5. Which of the following is used to elongation in the material?
a) Clinometer
b) Extensiometer
c) Micrometer
d) Feeler gaugeView Answer

Answer: b
Explanation: An extensiometer is a gauge which is attached to the specimen and it gives us the value of elongation in the body at a time. Feeler gauge and micrometer or clinometer cannot be used during the testing.

6. The yield limit of compression and the tensile test can be different for the same material.
a) True
b) FalseView Answer

Answer: a
Explanation: Titanium ( Ti ) is a material which shows different amount of yielding when subjected to tensile testing compared to when it is subjected to compressive testing.

7. An UTM can be used to conduct both tensile and compressive testing.
a) True
b) FalseView Answer

Answer: a
Explanation: A universal testing machine can be used to conduct tests like tension, compression, shear, friction, tear, stiffness. Many other such mechanical properties can be tested.

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8. Which of the following factors do not affect the testing?
a) Temperature
b) Increase in number of axes for application of load
c) Fatigue
d) PressureView Answer

Answer: d
Explanation: Increase in temperature and increase in the number of axes for load application can affect the testing results in a tensile or compressive test.